Full Details

Name and Model Number Pickett Model 106-C
Proportional Slide Rule
Country of Origin USA / Japan
Date of Manufacture Estimate late 60's
Front Scales Reproduction size, original size, per cent , number of times reduced
Back Scales None
Scale Length 40 cm (16 inches), disk diameter 15 cm (5.8 inches)
Type of Rule Disc
Construction Plastic
Area of Use Technical
Comment Used for calculating proportions
Rarity RR
Donor Collection of Clay Castleberry
Match Number 366
(Click Picture for Details)

In conjunction with our 'donors' we assign a rarity rating to each item, based on the system devised by Herman van Herwijnen
(1929 - 2004), renowned Dutch collector, author, and creator of Herman's Archive, a collection of 5,000 slide rule images on CD.
• RR = Rare - 1 of 25 collectors has one; it may take a year to find an example in the marketplace.
• RRR = Very Rare - only a few known to collectors; may be several years before it comes up for sale.
• RRRR = Extremely Rare - a museum piece; unlikely that an example will come up for sale.